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class FakeCodeActivity<T> : CodeActivity
{
// Define an activity input argument of type string
    public InArgument<T> Expression { get; set; }
    public T Value {get; private set;}
    // If your activity returns a value, derive from CodeActivity<TResult>
    // and return the value from the Execute method.
    protected override void Execute(CodeActivityContext context)
    {
        // Obtain the runtime value of the Text input argument
        Value = (T)context.GetValue(
this.Expression);
}
}
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// Evaluate<Class1, int>("x.A + x.B", "x", x);
public static T Evaluate<S, T>(string expression, string varName, S obj)
{
string assemblyname = typeof(S).Assembly.GetName().Name;
string ns = typeof(S).Namespace;
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